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Tang Sida,Huang Xiaohong,Li Qunzhan,Yang Naiqi,Liao Qinyu,Sun Ke 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3
Traction power fl uctuations have economic and environmental eff ects on high-speed railway system (HSRS). The combination of energy storage system (ESS) and HSRS shows a promising potential for utilization of regenerative braking energy and peak shaving and valley fi lling. This paper studies a hybrid energy storage system (HESS) for traction substation (TS) which integrates super-capacitor (SC) and vanadium redox battery (VRB). According to the characteristics of the traction load under actual operating conditions, an energy management strategy with fi xed-period control (FPC) is proposed, which fully leverages the periodicity and regularity of HSRS operation. To achieve the optimal size, economic feasibility is selected as the optimization objective, which is fully assessed in terms of Net Present Value (NPV). The optimization constraints are formulated in which the Discrete Fourier Transform (DFT) is performed for power allocation between SC and VRB. Besides, an improved mutation-based particle swarm optimization (IMBPSO) is proposed to effi ciently solve the optimization and enhance convergence performance. Finally, combined with the measured traction load data, the eff ectiveness of the FPC energy management strategy is verifi ed and the optimal scale of the HESS is provided.
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